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with a view of determining this point I have been induced to 

 make the following experiment, May the 25th, 1801, during 

 rain and the wind E. 



In a room 13,25 feet high, 24 feet long and 19 broad, 

 whofe cubic . contents of air were therefore fix thoufand 

 and thirty-three feet, I fufpended by hooks from cords 7,5 feet 

 high, and about the middle of the room, two fheets previoufly 

 wetted, but out of which the moifture had been fo far wrung 

 that no drops fell from them, at the diftance of 4,5 feet from 

 each other, and placed a thermometer between them at the 

 diftance of about two feet three inches from each, and at the 

 height of five feet, and another thermometer eighteen inches 

 higher than the fheets, and alfo a thermometer on each external 

 iide of the fheets, at the diflance of two feet on one fide and 

 eighteen inches on the other. 



To eflimate the lofs of moifture in the fheets by evaporation, 

 I cut a fquare foot of the fame linen, which weighed, when dry, 

 three hundred and fifty grains, and when wetted, and fo much 

 moiflure wrung out of it as not to drop, feven hundred and 

 twenty-feven grains ; it was fufpentled by a wire from the fcale 

 of a balance. 



Ss 2 The 



